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Related Party Transactions - Other (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Related Party Transactions |  |  |  |  |  |
Expenses incurred |  | $ 37,050,000 | $ 31,223,000 | $ 105,275,000 | $ 101,332,000 |
Related Party |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Expenses incurred |  | 0 | 800,000 | 600,000 | 2,500,000 |
Related Party | Westrock Group, LLC |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Expenses incurred | $ 10,000,000.0 | 500,000 | $ 300,000 | 1,300,000 | $ 1,000,000.0 |
Related Party | Accrued expenses and other current liabilities | Westrock Group, LLC |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Short-term related party debt |  | $ 0 |  | $ 0 |  | $ 0

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